Practice Test Discussion

Q)

Three small pumps and one large pump are filling a tank. Each of the three small pump works at 2/3 of the rate of the large pump. If all four pumps work at the same time, they should fill the tank in what fraction of the time that it would have taken the large pump alone?

    • Explanation

    As per the question,

    Capacity of three small pumps = Capacity of two large pumps

    Also, if we want to express the capacity of three small pumps + one large pump in terms of large pump, we should add one large pump on both sides of the above equation

    If we add one large pump on both sides of the above equation, we get

    Three small pumps + one large pump = Three large pumps

    Thus, if all the four pumps are open together, they would fill the tank in 13rd of the time large pump would have taken alone.

    Hence option B is correct.

    For more Short tricks and formulae click 

    Pipes and cisterns

    - Share with your friends! -

    Login to post your comment here...

    Comments